Some creaking is normal. I've seen quite a few rigs with WD hitches improperly set up (probably from the dealership). The best thing to do is, like they said, read the instruction and take all the measurements. It takes a little trial and error the first time. If you find that one link is not enough and the next link is too much, tilt the head forward one notch (mine, and there are different styles, moves about half a link for each position of head adjustment) and put it back on the link that was too much and try again. Or...go the other way and tilt the head back and use the link that wasn't enough. Make sure the bars are parallel to the frame or pointed slightly down when loaded or they're not doing you any good leverage wise.
2015 Chevy Silverado LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition